EP0445127B1 - Procede et dispositif pour etablir au moins une tension de seuil dans une regulation lambda en boucle fermee - Google Patents

Procede et dispositif pour etablir au moins une tension de seuil dans une regulation lambda en boucle fermee Download PDF

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Publication number
EP0445127B1
EP0445127B1 EP89911535A EP89911535A EP0445127B1 EP 0445127 B1 EP0445127 B1 EP 0445127B1 EP 89911535 A EP89911535 A EP 89911535A EP 89911535 A EP89911535 A EP 89911535A EP 0445127 B1 EP0445127 B1 EP 0445127B1
Authority
EP
European Patent Office
Prior art keywords
voltage
measured
countervoltage
threshold voltage
threshold
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89911535A
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German (de)
English (en)
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EP0445127A1 (fr
Inventor
Adolf Fritz
Jürgen Zimmermann
Christian Rein
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0445127A1 publication Critical patent/EP0445127A1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
    • F02D41/1476—Biasing of the sensor

Definitions

  • the invention relates to a method for determining at least one threshold voltage in lambda one control, with a lambda probe, to which a voltage is connected, which essentially corresponds to the desired switching voltage.
  • the invention also relates to a device for performing such a method.
  • control is carried out in the lean direction as long as the measured voltage is above a changeover threshold voltage, and control is carried out in the rich direction if it is above it.
  • the switching threshold voltage is usually close to the counter voltage, e.g. B. 10 mV above this.
  • the counter voltage is 450 mV
  • the upper switch-on threshold voltage is 500 mV
  • the lower switch-on threshold voltage is 400 mV
  • the switchover threshold voltage is 460 mV.
  • a digital value is permanently assigned to each voltage value. In the example, these are the values 130, 143, 117 and 132.
  • a highly precise reference voltage source is used, that is, not the usual voltage stabilizer, which u. a. provides the usual logic voltage of + 5 V for electronic components.
  • the voltage of the reference voltage source is divided with high-precision, temperature-stable resistors in such a way that the desired counter voltage is set.
  • the threshold voltages are related to this precisely set counter voltage.
  • software tuning can also take place in such a way that exactly the predetermined digital value for the counter voltage is set.
  • the invention has for its object to be able to do without the highly accurate reference voltage source and without high-precision resistors. For this purpose, a method and a device are to be specified.
  • the invention is for the method by the features of claim 1 and for the device by the features of Claim 6 given.
  • Advantageous further developments and refinements of the method are the subject of subclaims 2-5.
  • the method according to the invention is characterized in that the counter voltage is measured and threshold voltages are related to the measured counter voltage. Is the measured counter voltage z. B. 460 mV instead of 450 mV, the upper switch-on threshold voltage U O is set to 510 mV instead of 500 mV. It is pointed out that, strictly speaking, it is not known whether the counter voltage is 455 mV or 465 mV, since there is no high-precision reference voltage source for comparison. Exact knowledge is also not important, since other tensions that are important, e.g. B. the switch-on threshold voltages are related to the measured voltage. This ensures that, for. B.
  • the two switch-on threshold voltages are always symmetrical to the counter voltage, regardless of what the exact value of the counter voltage is.
  • the digital value of the measured counter voltage z For example, 13 units are always added to obtain the value for the upper switch-on threshold voltage, or 13 units are subtracted in order to arrive at the lower switch-on threshold voltage. Other distances or asymmetrical distances can be set accordingly.
  • the switchover threshold voltage is advantageously also related to the measured voltage.
  • threshold voltages are related to the measured countervoltage, it is no longer necessary to set the countervoltage to a precisely specified value with the aid of a highly precise reference voltage source and with the aid of highly accurate resistors. Rather, the voltage from the usual voltage stabilizer can be used and resistors with normal accuracy can be used.
  • An apparatus for executing the above-mentioned method has a means for measuring the counter voltage and a means for relating threshold voltages to the counter voltage.
  • a lambda probe 10 which is represented by its equivalent circuit diagram, namely by a DC voltage source 11 with the probe voltage U S and a resistor 12 with the internal resistance value R S.
  • a counter voltage U G is connected across the probe voltage via a load resistor 13 with the resistance value R L. This is generated by dividing the + 5 V voltage of a voltage stabilizer 14. In the exemplary embodiment, it should be 450 mV. However, this value fluctuates by a good 5% up and down, since the output voltage from the voltage stabilizer 14 depends on its input voltage, that is to say the battery voltage, on the load on the stabilizer and on the effects of temperature and aging.
  • This voltage is fed to an A / D converter 17, the digital output values of which are processed by a microcomputer 18 for lambda control purposes.
  • the microcomputer 18 checks in particular whether the input voltage U E has exceeded an upper switch-on threshold voltage U O or has fallen below a lower switch-on threshold voltage U U.
  • These threshold voltages are in the embodiment no longer at precisely predefined values, but rather they lie by predefined count values above or below the count value which arises at the output of the A / D converter 17 when the counter voltage U G is measured with the aid of the differential amplifier 16.
  • the process just mentioned is shown in the flow chart of FIG. 2.
  • the counter voltage U G is measured in a step s1.
  • a difference value ⁇ U O is counted for the measured voltage in order to achieve the value for the upper switch-on threshold voltage U O
  • a difference ⁇ U U is subtracted in order to obtain the lower switch-on threshold voltage U U
  • a voltage ⁇ U UM added to provide a switching threshold voltage U UM . If the latter threshold voltage is exceeded or undershot by the input voltage U E , the control direction is reversed.
  • a customary control method is carried out in a subroutine in accordance with step s3.
  • the subroutine in step s3 is executed repeatedly. This repeated execution can be preceded by a new measurement of the counter voltage and the setting of threshold voltages. This is shown by the dashed return line in FIG. 2.
  • predetermined times eg B.
  • An operating state which triggers the measurement can be overrun operation which lasts for a few seconds. In this case it cools the probe off, and so far with extended overrun that it is even no longer ready for control when the overrun is ended. Sufficient time is available to carry out steps s1 and s2 during overrun operation, since no control processes take place. If the overrun mode ends, the values determined in step s2 can be used to check whether the probe is ready for control.
  • the input voltage U E corresponds to the counter voltage U G.
  • the internal resistance value R S is over 1 MOhm, while the load resistance value R L is only in the order of a few 100 ohms.
  • the counter voltage can thus be measured in the simplest way by measuring the measured input voltage U E is equated.
  • the probe voltage is disconnected by opening a switch 19 so that the input voltage U E is identical to the counter voltage U G to measure the counter voltage.
  • the probe voltage is disconnected by opening a switch 19 so that the input voltage U E is identical to the counter voltage U G to measure the counter voltage.
  • the counter voltage is generated by a counter voltage source 21. How this is designed is irrelevant.
  • the switch 19 in the circuit diagram according to FIG. 3 and the changeover switch 20 in the circuit diagram according to FIG. 4 together with the differential amplifier 16, the A / D converter 17 and the microcomputer 18 serve as means for measuring the counter voltage.
  • the measurement of the counter voltage is controlled in that the microcomputer 18 triggers the measuring process when a predetermined condition occurs, e.g. B. at the start of the internal combustion engine or after prolonged overrun or when the internal resistance of the probe is measured, when this internal resistance exceeds a certain threshold. It is pointed out that if the measurement is taken when the internal combustion engine starts, it is expedient to wait until it has completed a few revolutions.
  • the microcomputer 18 is not only part of the means for measuring the counter voltage, but it is also a means for relating threshold voltages to the measured counter voltage. It also has a memory that either stores the measured counter-voltage or the threshold voltages calculated with the aid of it.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Dans le procédé décrit, la tension de seuil n'est plus fixée à une valeur prédéterminée avec précision, au moyen d'une source de tension de référence très précise. Au lieu de cela, une contre-tension est connectée en opposition à la tension de la sonde et mesurée, et la ou les tensions de seuil sont mises en corrélation avec la valeur mesurée dont la valeur absolue ne doit pas être nécessairement connue. Ce procédé permet de se dispenser d'une source de tension de référence très précise et de résistances de haute précision. Celles-ci sont remplacées dans le dispositif décrit par un moyen de mesure de la contre-tension et un moyen pour mettre en corrélation les tensions de seuil avec la contre-tension.

Claims (6)

  1. Procédé pour déterminer au moins une tension de seuil dans le cas d'une régulation lambda en boucle fermée, avec une sonde lambda, sur laquelle est branchée en opposition une tension d'opposition, procédé caractérisé en ce qu'on mesure la tension d'opposition et on établit les tensions de seuil en fonction de la tension d'opposition mesurée.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on mesure la tension d'opposition quand la sonde lambda est froide.
  3. Procédé selon la revendication 2, caractérisé en ce que les tensions de seuil d'enclenchement, qui servent à reconnaître si la régulation de la sonde est prête à fonctionner, sont établies en fonction de la tension d'opposition mesurée.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la tension de seuil d'inversion qui sert à insérer le sens de la régulation est établie en fonction de la tension d'opposition mesurée.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'on mesure la tension d'opposition à des intervalles de temps réguliers.
  6. Dispositif pour la détermination d'au moins une tension de seuil dans le cas d'une régulation lambda en boucle fermée, avec une sonde lambda à laquelle est branchée en opposition une tension d'opposition, caractérisé par :
    - un moyen (19, 20, 16, 17, 18) pour mesurer la tension d'opposition et
    - un moyen (18) pour établir les tensions de seuil en fonction de la tension d'opposition mesurée.
EP89911535A 1988-11-24 1989-10-19 Procede et dispositif pour etablir au moins une tension de seuil dans une regulation lambda en boucle fermee Expired - Lifetime EP0445127B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3839634A DE3839634A1 (de) 1988-11-24 1988-11-24 Verfahren und vorrichtung zum festlegen mindestens einer schwellspannung bei lambda-eins-regelung
DE3839634 1988-11-24

Publications (2)

Publication Number Publication Date
EP0445127A1 EP0445127A1 (fr) 1991-09-11
EP0445127B1 true EP0445127B1 (fr) 1993-02-24

Family

ID=6367781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89911535A Expired - Lifetime EP0445127B1 (fr) 1988-11-24 1989-10-19 Procede et dispositif pour etablir au moins une tension de seuil dans une regulation lambda en boucle fermee

Country Status (7)

Country Link
US (1) US5119788A (fr)
EP (1) EP0445127B1 (fr)
JP (1) JPH04501898A (fr)
KR (1) KR0147073B1 (fr)
BR (1) BR8907785A (fr)
DE (2) DE3839634A1 (fr)
WO (1) WO1990005840A1 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300507A (en) * 1975-02-25 1981-11-17 The Bendix Corporation System controlling any air/fuel ratio with stoichiometric sensor and asymmetrical integration
JPS5632585Y2 (fr) * 1975-10-27 1981-08-03
DE2649272C2 (de) * 1976-05-22 1986-04-03 Robert Bosch Gmbh, 7000 Stuttgart Regelverfahren und Gemischverhältnisregeleinrichtung zur Bestimmung der Verhältnisanteile eines einer Brennkraftmaschine zugeführten Kraftstoff-Luftgemisches
US4169440A (en) * 1977-12-01 1979-10-02 The Bendix Corporation Cruise economy system
US4156413A (en) * 1977-12-01 1979-05-29 The Bendix Corporation Cruise economy system
DE2919220A1 (de) * 1979-05-12 1980-11-27 Bosch Gmbh Robert Verfahren zur regelung des kraftstoff/luftverhaeltnisses bei brennkraftmaschinen
US4491921A (en) * 1980-12-23 1985-01-01 Toyota Jidosha Kogyo Kabushiki Kaisha Method and apparatus for controlling the air fuel ratio in an internal combustion engine
DE3149136A1 (de) * 1981-12-11 1983-06-23 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur regelung des kraftstoff-luftverhaeltnisses bei brennkraftmaschinen
DE3319432A1 (de) * 1983-05-28 1984-11-29 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und einrichtung zur regelung des betriebsgemisches einer brennkraftmaschine
DE3741527A1 (de) * 1987-12-08 1989-06-22 Bosch Gmbh Robert Steuer-/regelsystem fuer eine brennkraftmaschine
DE3840148A1 (de) * 1988-11-29 1990-05-31 Bosch Gmbh Robert Verfahren und vorrichtung zum erkennen eines fehlerzustandes einer lambdasonde

Also Published As

Publication number Publication date
EP0445127A1 (fr) 1991-09-11
BR8907785A (pt) 1991-08-13
DE3839634A1 (de) 1990-05-31
KR0147073B1 (ko) 1998-08-17
KR900702191A (ko) 1990-12-06
JPH04501898A (ja) 1992-04-02
WO1990005840A1 (fr) 1990-05-31
DE58903617D1 (de) 1993-04-01
US5119788A (en) 1992-06-09

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